Alright guys, after months of searching and calling parts yards, I finally found myself a P-204UH! Now, I've tried navigating this bear of a thread, but it's hard to keep up with the new revisions and other thread spawns... I plan to add an after-market, amplified sub (Infinity Basslink), as well as AUX-in, and Sirius satellite radio. I've read about SVXdc's adapters, and it seems I may need one of them, though I'm not above soldering and splicing to save some bucks! I already have the Basslink, the HU is on its way, and my deadline is two weeks. What do I need to order now?